Special plug-in lightning arrester for high-safety transformer

Abstract

The special plug-in lightning arrester comprises a main body, an explosion-proof cover is arranged at one end of an upper electrode of the main body, a plurality of first pressure relief holes and a plurality of second pressure relief holes are arrayed on the explosion-proof cover, a fixing ring is arranged at the upper end of the explosion-proof cover, the periphery of the fixing ring is abutted against a sleeve, a shell grounding bolt is arranged on the fixing ring, and the shell grounding bolt is connected with the explosion-proof cover. The end cover is clamped at the top end of the sleeve, a first through hole corresponding to the shell grounding bolt and a second through hole corresponding to the low-voltage grounding bolt are formed in the end cover, a rod body of the shell grounding bolt penetrates through the first through hole, a locking cap is arranged at the upper end of the rod body, an insulating sleeve is arranged on the low-voltage grounding bolt, and a spring is further arranged between the end cover and the fixing ring. According to the multi-stage pressure relief valve, a multi-stage pressure relief structure is designed, and the multi-stage pressure relief valve is safer and more reliable.

Description

Technical Field

[0001] The utility model relates to a special plug-in lightning arrester for a high-safety transformer. Background Art

[0002] In the prior art, the plug-in arrester specially used for transformers is generally an integral structure, in which electrodes and resistors are encapsulated in a casing with only one or two pressure relief holes. When the arrester is inevitably damaged and not replaced in time, pressure will accumulate in the arrester. When the pressure accumulates to a certain level, it will cause the arrester to explode, posing a certain safety risk. Utility Model Content

[0003] The utility model aims to overcome the above-mentioned deficiencies of the prior art and to provide a high-safety transformer-specific plug-in arrester capable of multi-stage pressure relief.

[0004] The technical solution of the utility model is: a high-safety plug-in arrester for transformers, comprising a main body, an explosion-proof cover is provided at one end of the upper electrode of the main body, the explosion-proof cover is inserted into and fixed in the sleeve of the main body, the upper end of the upper electrode is in a frustum shape and a gap is maintained between the upper end and the rubber sleeve, a plurality of first pressure relief holes corresponding to the gap are arranged in an array on the explosion-proof cover, and a plurality of second pressure relief holes are arranged in an array on the periphery of the explosion-proof cover;

[0005] A fixing ring is provided at the upper end of the explosion-proof cover, the outer periphery of the fixing ring is in contact with the sleeve, and a housing grounding bolt is provided on the fixing ring;

[0006] It also includes an end cover, which is clamped on the top end of the sleeve, and has a first through hole corresponding to the shell grounding bolt and a second through hole corresponding to the low-voltage grounding bolt. The rod body of the shell grounding bolt passes through the first through hole and a locking cap is provided on the upper end. The low-voltage grounding bolt is provided with an insulating sleeve, and a spring is provided between the end cover and the fixing ring, and the two ends of the spring are respectively clamped on the end cover and the fixing ring.

[0007] Furthermore, the cross section of the explosion-proof cover is in a "concave" shape, and the edge of the explosion-proof cover is stuck between the rubber sleeve and the sleeve.

[0008] Furthermore, the end cover and the fixing ring are respectively provided with two convex rings corresponding to the springs.

[0009] Furthermore, a shielding layer is provided between the rubber sleeve and the sleeve.

[0010] Furthermore, a high-voltage contact is provided at the lower end of the main body.

[0011] Furthermore, a locking ring is provided on the high-voltage contact.

[0012] Furthermore, the high-voltage contact is connected to the rubber sleeve, and a gasket is provided between the high-voltage contact and the rubber sleeve.

[0013] Furthermore, a flange sleeve is provided at the lower end of the sleeve, and a fixing hole is provided on the flange sleeve.

[0014] The beneficial effects of the utility model are as follows: when the main body is inevitably damaged, the pressure is first released from the first pressure relief hole, the second pressure relief hole and the through holes, so as to avoid the pressure accumulation in the main body and cause the overall explosion; and when the pressure expands rapidly and the pressure relief holes cannot release the internal pressure in time, the entire explosion-proof cover pops out to the outside, driving the fixing ring and the shell grounding bolt to move toward the end cover, and a certain pressure can be buffered under the action of the spring; when the main body still cannot release the internal pressure in time and explodes, the end cover together with the fixing ring, the explosion-proof cover and the fragments are discharged along the top of the sleeve, so as to avoid the middle part of the main body from exploding and causing the fragments to splash, and the multi-stage explosion-proof structure can ensure the reliability of the lightning arrester and is safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 yes Figure 1 Enlarged view of part A in the middle;

[0017] Figure 3 It is a structural schematic diagram of the explosion-proof cover in the utility model.

[0018] In the figure: upper electrode 1, explosion-proof cover 2, sleeve 3, rubber sleeve 4, first pressure relief hole 5, second pressure relief hole 6, fixing ring 7, shell grounding bolt 9, end cover 10, low-voltage grounding bolt 11, spring 12, convex ring 13, high-voltage contact 14, locking ring 15, flange sleeve 16. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0020] Combination Figure 1-3 As shown, a high-safety plug-in arrester for transformers includes a main body, an explosion-proof cover 2 is provided at one end of an upper electrode 1 of the main body, the explosion-proof cover 2 is inserted into and fixed in a sleeve 3 of the main body, the upper end of the upper electrode 1 is in a frustum shape and a gap is maintained between the upper end and the rubber sleeve 4, a plurality of first pressure relief holes 5 corresponding to the gap are arranged on the explosion-proof cover 2, and a plurality of second pressure relief holes 6 are arranged on the periphery of the explosion-proof cover 2;

[0021] A fixing ring 7 is provided at the upper end of the explosion-proof cover 2, the outer periphery of the fixing ring 7 is in contact with the sleeve 3, and a housing grounding bolt 9 is provided on the fixing ring 7;

[0022] It also includes an end cover 10, which is clamped on the top end of the sleeve 3. The end cover 10 has a first through hole corresponding to the shell grounding bolt 9 and a second through hole corresponding to the low-voltage grounding bolt 11. The rod body of the shell grounding bolt 9 passes through the first through hole and a locking cap is provided on the upper end. The low-voltage grounding bolt 11 is provided with an insulating sleeve. A spring 12 is also provided between the end cover 10 and the fixing ring 7, and the two ends of the spring 12 are respectively clamped on the end cover 10 and the fixing ring 7.

[0023] In the above structure, when the main body is inevitably damaged, the pressure is first released from the first pressure relief hole 5, the second pressure relief hole 6 and the through holes, which can avoid the pressure accumulation in the main body and cause the overall explosion; and when the pressure expands rapidly and the pressure relief holes cannot release the internal pressure in time, the entire explosion-proof cover 2 pops outward, driving the fixing ring 7 and the shell grounding bolt 9 to move toward the end cover 10, and a certain pressure can be buffered under the action of the spring 12; when the main body still cannot release the internal pressure in time and explodes, the end cover 10 together with the fixing ring 7 and the explosion-proof cover 2 are discharged along the top of the sleeve 3, which can avoid the middle part of the main body from exploding and causing fragments to splash. The multi-stage explosion-proof structure can ensure the reliability of the lightning arrester and is safer to use.

[0024] In another embodiment, in combination Figure 1 and Figure 2 As shown, the cross section of the explosion-proof cover 2 is in a "concave" shape, and the edge of the explosion-proof cover 2 is stuck between the rubber sleeve 4 and the sleeve 3 to ensure the reliability of the fixation of the explosion-proof cover 2 and prevent it from falling off easily.

[0025] In another embodiment, in combination Figure 1 and Figure 2 As shown, the end cover 10 and the fixing ring 7 also have two convex rings 13 corresponding to the springs 12, respectively. The two convex rings 13 play a guiding and shielding role.

[0026] In another embodiment, a shielding layer is further provided between the rubber sleeve 4 and the sleeve 3 .

[0027] In another embodiment, if Figure 1 As shown, a high voltage contact 14 is also provided at the lower end of the main body.

[0028] In another embodiment, if Figure 1 As shown, a locking ring 15 is also provided on the high-voltage contact 14 to ensure the reliability of the connection between the high-voltage contact 14 and the transformer.

[0029] In another embodiment, if Figure 1 As shown, the high-voltage contact 14 is connected to the rubber sleeve 4, and a gasket is provided between the high-voltage contact 14 and the rubber sleeve 4.

[0030] In another embodiment, if Figure 1 As shown, a flange sleeve 16 is further provided at the lower end of the sleeve 3, and a fixing hole is provided on the flange sleeve 16. The fixing hole is used for connecting and fixing the arrester and the transformer after being connected, so as to ensure the reliability of the entire arrester after being fixed.

Claims

1. A high-safety plug-in arrester for transformers, comprising a main body, characterized in that: An explosion-proof cover (2) is provided at one end of the upper electrode (1) of the main body. The explosion-proof cover (2) is inserted into and fixed in the sleeve (3) of the main body. The upper end of the upper electrode (1) is in a frustum shape and maintains a gap with the rubber sleeve (4). A plurality of first pressure relief holes (5) corresponding to the gap are arranged on the explosion-proof cover (2). A plurality of second pressure relief holes (6) are also arranged on the periphery of the explosion-proof cover (2); A fixing ring (7) is provided at the upper end of the explosion-proof cover (2), the outer periphery of the fixing ring (7) is in contact with the sleeve (3), and a housing grounding bolt (9) is provided on the fixing ring (7); The invention also comprises an end cover (10), wherein the end cover (10) is clamped on the top end of the sleeve (3), and the end cover (10) has a first through hole corresponding to the housing grounding bolt (9) and a second through hole corresponding to the low-voltage grounding bolt (11), the rod of the housing grounding bolt (9) passes through the first through hole and a locking cap is provided at the upper end thereof, and an insulating sleeve is provided on the low-voltage grounding bolt (11), and a spring (12) is further provided between the end cover (10) and the fixing ring (7), and the two ends of the spring (12) are respectively clamped on the end cover (10) and the fixing ring (7).

2. A high-safety transformer-specific plug-in arrester as claimed in claim 1, characterized in that: The cross section of the explosion-proof cover (2) is in the shape of a Chinese character "concave", and the edge of the explosion-proof cover (2) is inserted between the rubber sleeve (4) and the sleeve (3).

3. A high-safety transformer-specific plug-in arrester as claimed in claim 2, characterized in that: The end cover (10) and the fixing ring (7) are also provided with two convex rings (13) corresponding to the springs (12) respectively.

4. A high-safety transformer-specific plug-in arrester as claimed in claim 3, characterized in that: A shielding layer is also provided between the rubber sleeve (4) and the sleeve (3).

5. A high-safety transformer-specific plug-in arrester as claimed in claim 4, characterized in that: A high-voltage contact (14) is also provided at the lower end of the main body.

6. A high-safety transformer-specific plug-in arrester as claimed in claim 5, characterized in that: The high-voltage contact (14) is also provided with a locking ring (15).

7. A high-safety transformer-specific plug-in arrester as claimed in claim 6, characterized in that: The high-voltage contact (14) is connected to the rubber sleeve (4), and a gasket is provided between the high-voltage contact (14) and the rubber sleeve (4).

8. A high-safety transformer-specific plug-in arrester as claimed in claim 7, characterized in that: The lower end of the sleeve (3) is also provided with a flange sleeve (16), and the flange sleeve (16) is provided with a fixing hole.

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